Add partial index on material(is_active) for the catalogue read

The modelling_e2e Lambda reads the active catalogue once per invocation
(SELECT * FROM material WHERE is_active ORDER BY id). Without an index this
was a full seq scan every time (~23ms), paid by all 32 concurrent Lambdas at
startup. Partial index on id WHERE is_active returns the active rows already
id-ordered — no sort, no filter.

Verified on dev: seq scan 23.2ms -> index scan 4.2ms.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/db/migrations/0247_glorious_darkhawk.sql

@@ -0,0 +1 @@
+CREATE INDEX "idx_material_active" ON "material" USING btree ("id") WHERE "material"."is_active";

src/app/db/migrations/meta/_journal.json

@@ -1723,6 +1723,13 @@
       "when": 1782498864047,
       "tag": "0246_minor_lady_bullseye",
       "breakpoints": true
+    },
+    {
+      "idx": 247,
+      "version": "7",
+      "when": 1782730761916,
+      "tag": "0247_glorious_darkhawk",
+      "breakpoints": true
     }
   ]
 }

src/app/db/schema/materials.ts

@@ -1,4 +1,4 @@
-import { InferModel } from "drizzle-orm";
+import { InferModel, sql } from "drizzle-orm";
 import {
   bigserial,
   text,
@@ -8,6 +8,7 @@ import {
   pgEnum,
   json,
   boolean,
+  index,
 } from "drizzle-orm/pg-core";
 
 export const MaterialType: [string, ...string[]] = [
@@ -125,6 +126,12 @@ export const material = pgTable("material", {
   includesScaffolding: boolean("includes_scaffolding").default(false),
   includesBattery: boolean("includes_battery").default(false),
   batterySize: real("battery_size"),
-});
+}, (table) => [
+  // The modelling_e2e Lambda reads the active catalogue once per invocation
+  // (WHERE is_active ORDER BY id). Without this index that is a full seq scan
+  // every time (~23ms, ×32 concurrent at startup). Partial on id so the active
+  // rows come back already id-ordered — no sort, no filter.
+  index("idx_material_active").on(table.id).where(sql`${table.isActive}`),
+]);
 
 export type Material = InferModel<typeof material, "select">;